Telescope Operational Concept
JMH: This document provides an executive summary of the overall control systems of the telescope/observatory.
The mount control system (MCS) is one of a number of sub-systems which
make up the overall telescope control system (TCS). These high-level
sub-systems run on Linux (CentOS) servers in the control room. The
high-level telescope control software consists of a dozen sub-systems
which control specific activities in the telescope and observatory.
These other sub-systems include the adaptive optics system (AOS), the
primary mirror cell (PMC) controls, the enclosure controls (ECS),
telemetry (TEL), optical supports (OSS), etc.. Most of the
sub-systems have corresponding hardware interface machines distributed
around the telescope and enclosure. For example a real-time VxWorks
machine controls each of the primary mirror cells, and Allen-Bradley
PLCs control the enclosure, enclosure rotation and some of the
telescope safety logic. Each sub-system has gigabit ethernet
connections for commmand and control, for reflective memory, and for
telemetry and logging. Not all TCS sub-systems have corresponding
hardware systems. For example the pointing control system (PCS) which
controls telescope tracking passes its trajectories on to the mount
control system, and the point spread function (PSF) control system
passes collimation information and active mirror figure corrections to
the primary mirror cells.
As a whole, the Telescope Control System (TCS) acts as a server to the client which is the Instrument. All sequencing of observations is done by the instrument software which sends specific requests to the TCS via the Instrument Interface (IIF). The IIF then converts these requests (e.g. preset the telescope to a new field) to specific commands to the other sub-systems.
If you want to read about the gory details, the following links lead to manuals for the various sub-systems.
Adaptive Optics System (AOS)
Enclosure Control System (ECS)
Guiding Control System (GCS)
Instrument Interface and Command Sequencer (IIF)
Mount Control System (MCS and MCSPU)
Optical Support System (OSS)
Pointing Control System (PCS)
Point Spread Function (PSF)
Primary Mirror Cells (PMC)
- 22 Oct 2010